Color photography



Nov. 10, 1925'- 1,561,168

' W. V. D. KELLEY ET AL COLOR PHOTOGRAPHY Filed Feb. 5. 1924 Wed TZT/

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Patented Nov. 10, 1925.

" UNnED-srATEs PATENT- OFFICE.

WILLIAM v. n. :KE-LLEI'OF JERSEY CITY, AND-Dominick monononn, or mm LEE,

NEW JERSEY, .A SSIGNORS TO I KELLEY COLOR LABORATORY, INC., PALISADE, NEW JERSEY, A CORPORATION OF NEW JERSEY. I Y

conon rnoroennrn LEY, a citizen of theUnited To all who mz't may concern:

Be it known that. we, W ILLIAM V. D. KEL- States, and a resident of the city of Jersey City,'county of Hudson, State of New Jersey, and DOMI- NICK TRONOLONE, a citizen of the United States, and a resident of the town of Fort Lee, county of Bergen, and State ofNew,

Jersey, have invented anew and useful Im provement in Color Photography, of which the following is a specification.

This invention relates to color-photography and particularly has referenceto the production of a plurality of colored registered images in a single coating on a transparent carrier. I

Hei'etofore quite a few processes have been proposed for forming what is known as acolor-photograph, that is, a

plmtograph which exhibits an image of a subjec wherein a color appears in kind and position corresponding to the coloring of the subject.

For making colored photographic motion picture film it has'heretofore been proposed to form two registered superimposed images in the same picture space, one being" formed of one color and the other being formed of a substantially complementary color. It has heretofore been proposed to secure one of the colors by a toning process and the other by tion involving the novel features of.appli-- cants invention progresses-and the novel features will be particularly polnted out in the appended ClfllIIlS;

In describing the invention in detail andthe particular physical product selected to illustrate the invention, reference is had to the accomdpanying drawing wherein we have illustrate particular referred physical product resultlng from t e practice of our invention. and wherein like characters of Appllcationflledrebruary 5, 1924. Seria1 No.,690,722.

reference designate. corresponding parts throughout the several views, and in which:

Figure lis a schematic representation of a colorediobject; Fig. 2, is arepresentation of the-ordinaryand well known red color selection negative of the object Fig. 1; Fig.

3, is a representation'of the ordinary and well known blue-green color selection negative of the object, Fi 1; Fig. 4, is a schematic representation 0 a black and made'from the negative Fig. 2; schematic representation of a white print made from the ne Fig. '6,illustrates the Fig.1, illustrates the print Fig. 5 colored; Fig. 8, illustrates the combination of colored prints,Figs. 6 and 7. In the drawing Figs. 4 and 5' are really representations of the same, say, film, one

Fig. 5, is a black and gative Fig. 3;

Fig. At after. a print from the red-orange Fig. 5, after printnegative Fig. 2, the other, ing from .the blue-green negative. Fig. 3 and Figs. '6 and 7 are of course consequently representations of the same, say, film, illusprint, Fig. 4 colored;

white print 7 trating'difi'erent operations thereon. Fig.8

is also a representation of the same single film with a single emulsion coatingthereon, illustrating the combined effect of'the different operations.

i will be necessary to secure two images one representative of one color in a subject and the other representative of a substantially complementary colorof the subject.

ages of course must be suitable to be used as negatives and in the further description .of this process will be referred to as negatives. One will be designated the bluegreen negative and the other the red negative. There are, many ways of securing' These im- In order tocarry out applicants process it '4 these [negatives well known to those skilled in this art and as applicants rocess does not depend upon the 'particu ar methods used for securing" the negatives no particular manner of securing them will be described and pointed out. The red negative in the drawing is-illustrated by Fig. 2. The blue-green negative by Fig. 3. v

Having secured the ne ative, one is placed in contact with the baclr of a transparent support carrying a single emulsion coating/ If motion pictures are being dealt with, then the negative would be placed in contact with the celluloid, that is, in contact with the uncoated side of the film and further, ordinary motion picture stock film would be used it being unnecessary to use any dye in the emulsion to act as a light retardant. The negative having been placed in contact with the back of the film a printing light is then allowed to shine therethrough and a latent image formed in the emulsion coating. In thus forming a latent image in the emulsion coating care is taken to so regulate the intensity of the printing light and the time of printing so that if possible the light sensitive material in the emulsion which will be acted upon, will be substantially only that positioned in substantially the lower thickness of the emulsion coating.

' After the printing with one negative through the back of the carrier the latent image is developed for about three minutes.

The particular developing bath considered by applicants to be most efficacious in enabling them to secure the desired result is neutral or acid and would be made up as follows: Diamidophenol- 5 g., sodium sulphite 30 g., potassium bromide .94 g., potassium iodide 10% solution 1.2 c. c., water 1 1.

After developing, the print should be washed for 5 minutes, resulting in the print Fig. 4, then if the image is to be formed as a blue-green image, the print' should be placed in what we term the color-forming bath. A satisfactory color-forming bath to develop a blue-green in the image is formed as follows: Oxalic acid 5 g., vanadium oxalate 10% solution 15 c. c., ferric and am monium oxalate 14 g., potassium ferricyanide 5 g., water 1 l.

The print should be allowed to remain in the blue-green color forming bath for 15' minutes and then washed for five minutes.

After the print has been washed it should be cleared. The applicants allow the clearing bath to act for ten minutes and find that a suitable clearing bath would be as follows: ammonium bromide 12 g., potassium bichromate 12 g., water 2 1.

After the print has been cleared it should be washed for ten minutes and dried. This drying must of course take place in the dark, orin a room illuminated by a light havin no effect upon the light sensitive material in the emulsion, that is, in most cases with a ruby light. After drying the fihished toned print would be illustrated by Fig. 6.

After the print has been dried a second latent image is then to be formed in the emulsion coating. This second latent image is to be formed by printing from the other negative by placing the same in contact with the emulsion and allowing a printing light to shine therethrough. The intensity of the printing light and the time of printing will be preferably so regulated that the color image formed by further manipulation resulting will be substantially complementary to the first color formed.

After the latent image is formed in the emulsion it is placed in the developing bath hereinbefore described and developed for three minutes, after which it is washed for five minutes and fixed in sodium thiosulfate 600 g., water 1 l. and then washed for fifteen minutes. The effect of this second printing and developing, disregarding the first formed blue green image would be illustrated by Fig. 5.

The film now containing a blue-green image and a reduced black silver image is placed in the red color forming bath. A red-orange color forming bath found suit able and preferred by the applicants would be formed as follows: uranium nitrate 9 g., potassium oxalate 4 g., hydrochloric acid 8 c. c., potassium ferricyanide 3.5 g., water 1 l.

The developed image would be allowed to remain in the red-orange-color forming bath for five minutes and then washed for five minutes. The result of the red-orange color forming bath would be illustrated by Fig. 7 disregarding the blue-green toning.

After the print has been last washed it would be fixed for five minutes in a bath formed as follows: sodium thiosulfate 600 g., potassium n'ietabisulphite 0 g., water 1 1.

After fixing, the print would be washed for ten minutes and then dried, thus completing the formation of the color photograph. That is, a transparent carrier having a coating on one side only and in that coating in the same picture area two registered super-imposed, substantially complementary colored images. The completed print toned blue-green and red-orange would be illustrated by Fig. 8.

Although applicants have illustrated the cants process and the tangible products to 1 be thereby produced.

What we claim is new and desire to secure by Letters Patent of the United States 1s:

1. A photographic process which consists in forming a latent image in a colloid layer, a developing in neutral or acid diamidophenol toning with an iron salt and after clearing with a bath of ammonium bromide and potassium bichromate in water solution forming an image toned with an uranium salt in tlhe same colloid layer in registry therewit 2. A photographic process which consists in formmg a latent image in a colloid layer developing in diamidophenol toning with an latent image in the same colloid layer, de-

veloping in diamidophenol'and coloring.

v 3. A step in a photographic process which consists in forming an image in a sensitized colloid layer, toning said image and clearing withv a bath of ammonium bromide and potassium bichromate in water solution.

4. A photographic process which consists informing an image in a sensitized colloid layer, toning said image and clearing with a bath of ammonium bromide and potassium bichromate in water solution and thereafter forming and toning another registering image in the same colloid layen I 5. A photographic process which consists in printing two registered images in the same colloid layer and toning the same which includes the intermediate step of clearing with a bath of ammonium bromide and bichromate in water solution;

- 6. A photographic process which consists in forming an image toned with an iron salt in a colloid layer and after clearing with a bath-of ammonium bromide and potassium bichromate in water solution forming an image toned with an uranium salt in the same colloid layer in register therewith.

7. The process which consists in first forming a silverimage in a colloid layer, then toning that image substantially a bluegreen, then forming another silver-image in the same colloid layer and toning that image substantially a red orange, without affecting the color of the first image.

8. A photographic process comprising'imprinting a negative image of an object from which certain color sensations have been omitted, upon light transmittive sensitized material, developing, washing and toning said image substantially a blue-green, clearing with a bath containing ammonium bromlde and potassium bichromate in water solution, Washing, drying and imprinting a second image of the same object, from which I other color sensations have been omitted,

upon said material in registry with the first image imprinted thereon, developing said second image, washing in sodium thiosulfate and washing, then toning said second image a substantially red-orange by immersion in a bath containing uranium nitrate, potassium oxalate, hydrochloric acid and potas sium ferricyanide in water solution, washing, fixing, washing and drying. v

9. A photographic process in which by means of perforations in the carrier of a single light sensit-ive emulsion two registered images are obtained, the first being printed, developed, converted to a salt of iron and bathed in a, bath containing bromide and bichromate and dried without fix ing, the second image being printed developed, fixedand converted to a salt of 'a metal giving a color tone complementary to the first.

10. The production in a colloid layer of silver print which is converted to a. salt of iron then bathed in a bath containing bichromate and bromide, dried anda second silver print produced in registry with the first and the latter converted to a salt of uranium without afiecting the color of the first image.

11. The production of two silver images in" registry in the same colloid layer both independently developed in a diamidophenol developer, the first being converted to a salt of iron followed by immersion in a bath containing bichromate and bromide and after drying, printing and developing the second image and converting the latter to a salt of uranium.

12. The method of producing two images in the same colloid layer and converting each to a salt of a metal of different color each image being independently developed in a diamidophenol developer with an immersion in a bath containing a bromide and a bichromate after the first conversion and before the second development.

'DOMINICK TRONOLONE.

-WILLIAM v. n KELLEY. 

